Mobility of Mn and other trace elements in Mn-rich mine tailings and adjacent creek at Kanye, southeast Botswana

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000150" target="_blank" >RIV/00025798:_____/21:00000150 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/21:10419422 RIV/60460709:41210/21:82084 RIV/61989592:15310/21:73608981

Výsledek na webu

<a href="https://doi.org./10.1016/j.gexplo.2020.106658" target="_blank" >https://doi.org./10.1016/j.gexplo.2020.106658</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gexplo.2020.106658" target="_blank" >10.1016/j.gexplo.2020.106658</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mobility of Mn and other trace elements in Mn-rich mine tailings and adjacent creek at Kanye, southeast Botswana

Popis výsledku v původním jazyce

Mine tailings rich in Mn and an adjacent creek at Kanye, southeast Botswana, have been investigated by totaldecomposition of solids, X-ray diffraction, EMPA techniques, sequential extraction, and water leaching to understandbinding and mobility of Mn and other trace elements. The investigation revealed weathering of tailingsclose to the surface of the tailings and higher concentrations of Fe compared to Mn. There also are high concentrationsof Ba and Pb in the tailings solids. The principal minerals of Mn and Fe are cryptomelane, K(Mn4+,Mn2+)8O16, and hematite, Fe2O3, respectively. Most Mn is bound to less crystalline phases dissolved in thereducible step of sequential extraction, suggesting high potential for release of Mn and related trace elements.The situation is very different for Fe, which is found mostly in the residual (Aqua Regia) insoluble fraction. This isin a good agreement with high concentrations of mobilized Mn and with low concentrations of mobilized iron inthe water leaching test. The order of water-leached trace elements is Ba >; Zn >; As >; V >; Cu >; Co >; Pbwhere trace elements bound in Mn-oxyhydroxides are preferentially mobilized. In particular, As and V mayrepresent a potential risk for the environment during rainy periods when mine tailings are probably flooded, andtailings material is transported by water in an ephemeral creek. Currently, sediments in the creek are contaminatedat least to the boundaries of the Kanye settlement and they can be a source of groundwater contaminationduring the rainy period. Another possible source of contamination is wind transport and settling ofdust particles from mine tailings with

Název v anglickém jazyce

Mobility of Mn and other trace elements in Mn-rich mine tailings and adjacent creek at Kanye, southeast Botswana

Popis výsledku anglicky

Mine tailings rich in Mn and an adjacent creek at Kanye, southeast Botswana, have been investigated by totaldecomposition of solids, X-ray diffraction, EMPA techniques, sequential extraction, and water leaching to understandbinding and mobility of Mn and other trace elements. The investigation revealed weathering of tailingsclose to the surface of the tailings and higher concentrations of Fe compared to Mn. There also are high concentrationsof Ba and Pb in the tailings solids. The principal minerals of Mn and Fe are cryptomelane, K(Mn4+,Mn2+)8O16, and hematite, Fe2O3, respectively. Most Mn is bound to less crystalline phases dissolved in thereducible step of sequential extraction, suggesting high potential for release of Mn and related trace elements.The situation is very different for Fe, which is found mostly in the residual (Aqua Regia) insoluble fraction. This isin a good agreement with high concentrations of mobilized Mn and with low concentrations of mobilized iron inthe water leaching test. The order of water-leached trace elements is Ba >; Zn >; As >; V >; Cu >; Co >; Pbwhere trace elements bound in Mn-oxyhydroxides are preferentially mobilized. In particular, As and V mayrepresent a potential risk for the environment during rainy periods when mine tailings are probably flooded, andtailings material is transported by water in an ephemeral creek. Currently, sediments in the creek are contaminatedat least to the boundaries of the Kanye settlement and they can be a source of groundwater contaminationduring the rainy period. Another possible source of contamination is wind transport and settling ofdust particles from mine tailings with

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geochemical Exploration

ISSN

0375-6742

e-ISSN

—

Svazek periodika

220

Číslo periodika v rámci svazku

January : 106658

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

nestránkováno

Kód UT WoS článku

000594241200009

EID výsledku v databázi Scopus

2-s2.0-85092115935